One experimental observation that demonstrates Einstein's ideas on the relativity of time, is
A) electromagnetic waves from the early stages of the development of the universe have slower rates of vibration.
B) muons "live" longer when moving rapidly than they do when they are at rest.
C) a laser beam emitted from an orbiting satellite is observed from Earth.
D) rapidly-rotating neutron stars spin more slowly than they would if they weren't moving rapidly away from us.
E) the recent discovery of very fast-moving particles known as tachyons.
B
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What do you notice about the relationship between the angular size of the galaxy and its redshift (how far the wavelength is shifted)?
A: The redshift tends to be larger if the angular size is smaller. B: The redshift tends to be smaller if the angular size is smaller. C: There seems to be no relationship between redshift and angular size.
What is the best way to determine a galaxy's redshift?
A) Find the galaxy's apparent distance, and look up the redshift based on Hubble's Law. B) Find the color of the galaxy, and estimate its distance based on how red the galaxy is. C) Measure the magnitude of the galaxy, estimate its distance, and calculate its redshift using Hubble's Law. D) Take a spectrum of the galaxy, and measure the difference in wavelength of spectral lines from the wavelengths of those same lines as measured in the laboratory.
One material used in nuclear bombs is 239Pu, with a half-life of 24,000 years. How long must we wait for a buried stockpile of this substance to decay to 1/1000 of its original activity?
A) 1,200,000 years B) 240,000 years C) 150,000 years D) 82,000 years E) 1,500 years
Young's Modulus: A 1200-kg car is being raised at a constant speed if 25 cm/s by a crane, using a 20-m long steel cable that is 1.5 cm in diameter. Young's modulus for steel is 2.0 × 1011 Pa. What is the change in length of the cable caused by the car?
A. 6.7 mm B. 6.7 cm C. 3.3 mm D. 3.3 cm E. 3.3 m